Diane M. McKnight 2015-01-18 tabular digitial data McMurdo Dry Valleys LTER McMurdo Dry Valleys LTER 10.6073/pasta/1b4935e0ddca8f5ecbb5074e76bec768 https://mcm.lternet.edu/content/algae-primary-productivity-reactivated-channel As part of the Long Term Ecological Research (LTER) project in the McMurdo Dry Valleys of Antarctica, water was diverted to a relict stream channel in order to reactivate the streamflow. The purpose of this experiment was to quantify the time scales of response to the arrival of water after many years of dessication. This data set includes results from light and dark incubations of algae to calculate net and gross primary productivity of algal communities from the Relict Channel in the Fryxell basin. 1996-01-11 1997-01-15 ground condition Data and metadata moved to DEIMS in 2015, to enhance LTER services Data from this table was initially included in the raw data files specified under the variable for 'file name'. These are Microsoft Excel version 6.0 files and can be found in the McMurdo LTER data manager's home directory on INSTAAR's Unix system. Once submitted to INSTAAR, the data manager combined all of the Relict Channel files that included information on primary production, and removed any variables that had no direct influence on the primary productivity of a given algal / incubation type. The resulting file is represented in the "relcprpr.dat" file used on the web page. As needed Relict Channel at Site_2 163.249588012695 163.249588012695 -77.622131347656 -77.622131347656 On the Stream team data page 163.302963256836 163.302963256836 -77.632797241211 -77.632797241211 Relict Channel at Site_3 163.249588012695 163.249588012695 -77.615768432617 -77.615768432617 LTER Core Areas primary production None <cntorg>McMurdo Dry Valleys LTER</cntorg> <onlink>http://mcmlter.org/</onlink> <span property="dc:title" content="McMurdo Dry Valleys LTER" class="rdf-meta element-hidden"></span> Not Applicable Not Applicable Field and/or Lab Methods Within each transect, algal mats were visually identified as either orange, red, black, or green. Not all types of algal mats were found within every transect. Algal samples were collected using a cork borer, placed in either light or dark vials, and incubated in the stream for 3 to 8 hours during sunny conditions. Primary productivity was measured as the change in oxygen concentration in the vial using an oxygen electrode. Net primary productivity (NPP, light bottles) and community respiration (CR, dark bottles) were calculated as follows: NPP or CR (ug C/cm2/hr)=((change in mg O2/L x v) x 0.375 C/O2 x 1000 ug/mg)/area/hours incubated, where O2/L = change in oxygen concentration, v = volume of vial (liters), C/O2 = atom/atom conversion of oxygen to carbon, area = area of cork borer (cm2). Within each transect, algal mats were visually identified as either orange, red, black, or green. Not all types of algal mats were found within every transect. Algal samples were collected using a cork borer, placed in either light or dark vials, and incubated in the stream for 3 to 8 hours during sunny conditions. Primary productivity was measured as the change in oxygen concentration in the vial using an oxygen electrode. Net primary productivity (NPP, light bottles) and community respiration (CR, dark bottles) were calculated as follows: NPP or CR (ug C/cm2/hr)=((change in mg O2/L x v) x 0.375 C/O2 x 1000 ug/mg)/area/hours incubated, where O2/L = change in oxygen concentration, v = volume of vial (liters), C/O2 = atom/atom conversion of oxygen to carbon, area = area of cork borer (cm2). unknown relcprpr Dataset code Code representing Relict Channel experiment locations dataset The data provider Code representing Relict Channel experiment locations dataset Location Code Abbreviated Location The data provider Abbreviated Location DATE_TIME Date of sample The data provider calendar date/time mm/dd/YYYY gregorian calendar Algae Type The type of algae species that is associated with the sample (red, black, green or orange) The data provider The type of algae species that is associated with the sample (red, black, green or orange) Incubation Type Light vs. dark incubation The data provider Light vs. dark incubation Replicate Number Replication number of sample The data provider Replication number of sample Change in CO2 over time CO2 change (mg/cm2/hrCO2) in a given hour The data provider mg/cm2/hr Change in CO2 per AFDM Change in level of CO2 per gram of ash free dry mass in a given hour The data provider mgC/gAFDM/hr Change in CO2 per Chl a Change in level of CO2 per mg of chlorophyll a in a given hour The data provider mgC/mgchla/hr File Name Raw data file containing information The data provider Raw data file containing information McMurdo Dry Valleys LTER The data distributor shall not be liable for innacuracies in the content http 1 0 \n 1 column , https://mcm.lternet.edu/sites/default/files/relcprpr.csv None 2015-01-18 2015-01-18 McMurdo Dry Valleys LTER http://mcmlter.org/ Biological Data Profile of the Content Standards for Digital Geospatial Metadata devised by the Federal Geographic Data Committee. Drupal Ecological information Management Systems, version D7, Biological Data Profile module